Answer: -75x + 45
Step-by-step explanation: Let's simplify this problem using the distributive property.
Let's first change the minus in front of the 3 to plus a negative.
Now we can distribute or multiply this -15 times each of the terms inside the set of parentheses.
So we get -15 (5x) + -15 (-3) and this simplifies to -75x + 45